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2000年,华盛顿州交通部用微波扩展网络

结合光纤微波网络,适应恶劣环境 & 传播成本降低

The Washington Department of Transportation (WSDOT) regional office 在韦纳奇 recently implemented a pragmatic solution to cut costs and improve reliability 在它的一个通讯链接上.

Wanting to eliminate expensive monthly long distance charges associated with dial-up telephone access to its 24-hour live Internet "Traffic-Cam" and Road Weather Information Station (RWIS) at Stevens Pass, 韦纳奇以西60英里, 华盛顿州运输局从2000年初开始寻找替代方案. 在2000年的秋天,找到了一个可行的 alternative became more urgent because WSDOT decided to install a new Highway Advisory Radio (哈尔) at Stevens Pass. (A 哈尔 is a Digital Message Programmer and AM Radio Transmitter for broadcasting traffic and weather conditions to motorists in the immediate area).

华盛顿州运输局的目标, 古斯塔夫松说, WSDOT电子技术员和ITS协调员, 是为了找到一种负担得起且可靠的方式来访问它的交通摄像头, 道路天气信息系统及公路咨询无线电.

“沙巴体育足球开户不想依赖长途电话线路,”席说, "so, 经过几个月的研究, I put together a proposal that would save $400 to $600 a month on long distance charges. Additional benefits included refreshing camera images more frequently and improving overall reliability and signal quality."

The proposal called for creating a direct link between Wenatchee and Stevens Pass. The plan was to use an existing microwave network between Wenatchee and Skyline Lake, then extend a communications link the 1 1/2 miles or so to the WSDOT communications site at Stevens Pass.

充满敌意的环境

微波网络已经就位, 但, 乍一看, installing the 1 1/2 mile link between Skyline Lake and Stevens Pass initially posed serious obstacles. Steep canyons and tall pine trees made burying cable or installing line-of-sight transmission equipment difficult. Interference from frequent summer lightning storms posed a continuous threat to transmission signal quality.

Mats initially considered wireless and copper, 但 eventually opted for fiber optic cable.

图1. 天际湖现有的微波网络(史蒂文斯 Pass)提供到WSDOT欧几里德街通信中心的链接 在韦纳奇. 光纤多路复用器和RS-232电话扩展器 都在史蒂文斯帕斯的光纤链路两端. 总成本 这四个单位可以支付 为自己在不到两年的时间里消除了长途跋涉 之前设置的成本.

“因为山区地形, wireless presented some inherent problems with the line of sight and getting enough speed to maintain voice quality,”垫解释说. "Burying copper (cable) required obtaining right-of way permission from the 为est Service and there were concerns about lightning and signal quality." 纤维 surged to the forefront when Mats discovered that the Chelan County Public Utility District (PUD) had installed a 12-strand fiber optic cable between its substation at Stevens Pass and the adjacent Microwave station at Skyline Lake. 最重要的是, two of the fibers were made available to WSDOT as part of a cooperative agreement with PUD.

“因为沙巴体育足球开户只需要安装光纤,000 feet or so from the RWIS Building (Stevens Pass Communications site) to the Substation, 这很有道理,”席说. “我还喜欢光纤提供的抗干扰能力."
下面是来自西澳史蒂文斯山口的24小时“交通摄像头”.
http://www.wsdot.wa.gov/Traffic/passes/stevens/
WSDOT解决了它的语音、数据 & video connectivity problem with fiber multiplexers and a unique rs - 232电话Extender.

rs - 232电话Extender

光纤数据链路很容易找到, 但 Mats spent considerable time searching for a suitable and affordable connectivity product to extend the telephone service to Stevens Pass. This was critical to the project because it enabled signficant cost savings by keeping telephone calls "local" from Wenatchee.


TC1900 RS-232或光纤电话分机是兼容的2线模拟pbx.

最终, 执行Chelan县PUD工程师Mark Boersma的建议, Mats settled on two products from fiber communications vendor 沙巴体育足球开户 in Irvine, 加州.

这些产品, an 8-channel fiber optic multiplexer with handshaking signals and a single channel telephone extender, 为流量摄像头提供数据接口(RS-232), Road Weather Information Station and a dial-up telephone interface for the Highway Advisory Radio. The Telephone Extender, which plugs into any RS-232 circuit, is compatible 2-wire analog PBXs.

The fiber multiplexer and RS-232 data Telephone Extender were located at each end of the fiber link between Skyline Lake and Stevens Pass. 总成本 for the four units would pay 为自己在不到两年的时间里消除了长途跋涉 charges. “沙巴体育足球开户研究了其他一些硬件和软件沙巴体育足球, 但是一种太贵了,另一种太贵了,”席说. “很明显,沙巴体育足球开户沙巴体育足球开户提供了最可行、最经济的沙巴体育足球."

是交通、天气系统 & 哈尔

的是交通, 提供史蒂文斯山口24小时天气状况的实时图像, 坐落在2号高速公路旁边的标志桥上方40英尺的一根杆子上.


底面特写的最大化其使用和有效性. 24小时交通摄像头.

Traffic-Cam images are transmitted to a server at the communications center 在韦纳奇, 然后送到华盛顿运输局奥林匹亚办事处. 该图像随后通过WSDOT网站发布到互联网上. (WSDOT Sevens的直接网址 通过相机 http://www.wsdot.wa.gov/Traffic/passes/stevens/).

"Camera images are transmitted at 5-minute to WSDOT communications centers 在韦纳奇 and Olympia,”垫. “当相机最初连接到 网站由一个长途电话线和一个33.6K modem, images were refreshed every 30 minutes to minimize long distance phone calls."

天气信息站收集各种天气资料 来自史蒂文斯帕斯附近传感设备的数据.

这些数据随后被传送到位于韦纳奇和奥林匹亚的WSDOT办公室, 以及华盛顿大学的天气学系.

这是WSDOT和史蒂文斯帕斯滑雪区合作的结果, 新的公路谘询电台于二零零一年二月中投入使用. It broadcasts at 1610 Khz to provide motorists with immediate traffic and weather conditions 在所有的季节.


天气信息站收集各种天气资料 来自史蒂文斯帕斯附近传感设备的数据. A 设备棚里的远程处理单元(RPU)进行采集 传感器的数据传送到 纤维/微波网络.

Designated WSDOT and Ski Area message coordinators call on an "as-needed" basis to program the 哈尔 with updated weather and traffic control information. The 哈尔 can store up to 250 different messages with a combined recording time of 14.3分钟. 据杰夫·亚当森说, WSDOT中北部地区通讯经理, 哈尔在滑雪季节特别有用.

"It enables skiers to tune in for messages on 1610 AM radio to hear which parking lots are open and which are full,”杰夫说. 在山坡上爬了一天后离开, 它还能让滑雪者立即调音,发现道路限制是否.g. 链要求)已经从WSDOT改变."

未来的计划

根据杰夫, future considerations for the Stevens pass communications network include installing a Stationary Changeable Message Sign (SCMS). Moreover, the existing availability of at least five more communications channels off of the fiber multiplexer helps give WSDOT a variety of options for its Stevens Pass intelligent transportation system network.

WSDOT道路天气信息系统

史蒂文斯帕斯的道路天气信息系统就是其中之一 华盛顿有超过1000个气象站. 虽然气象站的天气数据是本地使用的,但计算机 奥林匹亚的服务器会定期对它进行民意调查,最后它会在 位于西雅图的华盛顿大学天气中心.

邻近地区的传感器可以测量各种天气数据 包括空气温度,路面和地下公路温度, 高速公路湿度,防冰剂浓度,能见度, 湿度,风速和风向,以及气压. A 移除设备棚里的处理单元(RPU) 来自传感器的数据通过光纤/微波网络传输.

地下温度,通常测量到12英寸以下 高速公路表面,衡量多少“能源”是在道路上. 为 例如,高的地下能量可能导致降水冻结 在高速公路表面,即使气温在上面 冻结.

这对驾车者来说是很重要的信息,但它也告诉沙巴体育足球开户 气象局人员需要多少除冰液. 除了 要确定需要多少或多少除冰液,这个 信息还用于确保使用除冰液 在正确的“窗口”中与天气相关的变量到最大值 底面特写的最大化其使用和有效性.


天际湖微波塔及通讯大楼,1号.史蒂文斯山口上方5英里处.

天际湖内部通讯设备 建筑.

杰夫•亚当森, 华盛顿州运输局公关经理, 和垫Gustafsson, WSDOT电子技术员和ITS协调员.

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